we have received your enquiry of 15 october_in which_ you ad

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we have received your enquiry of 15 october_in which_ you advise us of your interest in cashmere.
此句为什么要选in which?
we have received your letter of septembe 12,_____ we are glad to know that you are interested in our electric heaters.( which at which in which from which）要选哪个答案呢?

in which 是一个非限制性定语从句的用法,具体是指in your enquiry,in which在此处做状语.你的这个句子有点像商业用语.
第二个句子我个人认为要选from which,具体是指from your letter,也是充当状语的成份.而且这个句子也有点像商业用语.
是吗?

we have received your enquiry of 15 october_in which_ you ad 英语翻译Thank you for your enquiry.We have a stock of 1000 of DP 外贸函电题 1.We have received your letter of 15 Oct.in which you 英语翻译Dear Sirs,We thank you for your enquiry of 10th Septembe We have just received your letter of September 11 Thank you for participating.We have already received your re 英语翻译We are very pleased to receive your enquiry of 15th Janu we have received your letter of May 16,2002,for which we tha Thank you for your email.We have received your comments/ques 英语翻译We have received your application,and we thank you for y 英语翻译We are honored to inform you that we have received your 英语翻译We have received your letter of May 15.With regard to ou